That explains fair amount of us, I think. I'm on the same camp. It makes it a bit challenging as my wife is extremely social, so finding balance is a bit tough for both of us :)
Even thought we are living in this city because it was the best for her career (She's a professional flamenco "bailaora" and where we lived before her career was dead in the water) she doesn't have a large amount of friends, but boy does she crave for going out.
She is really having a bad time going through this, while I'm surfing the wave without issues.